A solution of 5.0g benzoic acid (C₆H₅(CO)OH) in 100.0g of carbon tetrachloride (CCl₄) has a boiling point of 77.8°C. The boiling point of pure CCl₄ is 76.7°C. Calculate the molar mass.

A) 219.9 g/mol
B) 106.2 g/mol
C) 147.3 g/mol
D) 180.2 g/mol